Description An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application. Affected Spring Products and Versions Spring Boot: 4.0.0 - 4.0.5 3.5.0 - 3.5.13 3.4.0 - 3.4.15 3.3.0 - 3.3.18 2.7.0 - 2.7.32 Versions that are no longer supported are also affected. Mitigation Users of affected versions should upgrade to the corresponding fixed version. Affected version(s) Fix version Availability 4.0.x 4.0.6 OSS 3.5.x 3.5.14 OSS 3.4.x 3.4.16 Enterprise Support Only 3.3.x 3.3.19 Enterprise Support Only 2.7.x 2.7.33 Enterprise Support Only No further mitigation steps are necessary. References https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H&version=3.1 History 2026-04-23: Initial vulnerability report published.